Thread-loop stitching device



Oct.19, 1926. A. DIETZ THREAD LOOP STITCHING DEVICE Filed May 21 1924 TZ W. F e/ srs Patented Oct. 1 9, 1926.

ADOLF DIETZ, OF

HAMBURG, GERMANY,

ASSIGNOB TO TEPPICHFAIBBIG-ZEHTRALE A.-G., OF LIElIPZIG-IMOCK A'U', GERMANY.

THREAD-LOO? STITCEHQ'G DEVICE.

Application filed May 21, 1924, semi no.

Thread loop stitching devices for stitching large surfaces of material are known wherein a loop holder is placed close to the needle which receives the thread, the loop holder being adapted to retain the loops when the needle is drawn out of the material and controls the forward movement of the needle.

The "subject of the invention is a thread 1 loop stitching device for the production of carpets, mats and the like of any suitable size wherein scissors are provided on the loop holder which are adapted to cut the loop formed by the needle at its lowest position. The device is preferably so arranged, that on the ti htenin limb of the scissors, formed by the 00p ho der, there is provided a rotatab e limb which is o erated y a rod actczllated by a device provi ed on the guide ro An example of construction is shown by waIy of example wherein-- igures 1 and 2 show a device in front and side elevation on a reduced scale.

Figures 3 and 4 show the o crating device for t e rod in front and si e elevation in substantially normal size, and

Figures 5 to 8 show the scissors in various position in substantially normal size. Two guide rods 6 and 0 provided with handles a are connected together at their slots (2 by adjustable screw bolts 6. At the lower end of the rod b is secured a needle f, whilst the rod 0 carries at its lower end a loop holder of which one limb h is formed as one limb of a air of scissors. To the loop holder there 1s rotatably secured by means of a screw 2' a second is of the scissors to the lever l of which is connected a rod m. The other end of this rod is connected to the crank shaft 0 which is mounted in provided on theguide rod 0.

The shaft 0 is rovided with a toothed clutch member q t e form of which can be seen from Fi 3. A second toothed clutch member r is loosely rotatable on said shaft and is capable of movement into and out of earings p engagement with the member u. The memd k with its lever l is caused to abut agalnst ft the stop '0 on the 60 her r, by the agency of a sprin a, is presse into en agement with the me er 4 on sha 0, so t at said shaft will rotate when the member r is revolved. The member 1' is,

upon guide rod 6 being reciprocated, actuinnona 714,788, and in Germany August 25, 1923.

ated by means of a lug or projection u provided thereon. 'When the rod 6 moves downwardly the member tate the shaft 0, but upon the upstroke of said rod the member 1- rides over the teeth of the member q without rotatingl said shaft. Upon the guide rod 1), below t e lug u, a stop '0 is provided, which, at the time when the needle 7 and the guide rod b occupies its lowermost position, and the loop holder is in its topmost position, strikes against the lever Z of the shear-limb k, so as to depress said lever and cause the shears to assume the open position. A spring t has one end attached to the support p and its other end engaged in a notch of the shaft 0, said spring being operable to yieldably retain the shear limbs h and k in open position.

The operation of the device is as follows: The guide rod 12 with needle f, by means of the handle a, is from the reverse side thereof (Fig. 5). As soon as the needle has reached the lower-, most position, the guide rod 0 withthe loop holder is likewise projected through the cloth (Fig. 6). The needle is then pulled out of the material. again, while the loop formed is held fast by the loop holder (Fig. 7). If the needle is then again thrust through the material to form the next loop at a certain distance, the rojection u arranged on the guide rod 0 f the needle engages with the clutch member 1', and'causes the same to be turned a certain distance. Owing to the fact that the member 1' enages with the member 9 of the shaft 0 the atter will be rotated, with the result that,

h by way of the crank n, pull rod m, lever Z,

and shear-limb k the shears will be closed, andv the thread cut (Fig. 8). The shears, for the time being, remain in closed position, owing to the fact that the shaft 0 and the member 1" also remain in their ositions r operates to ro-.

thrust into the materialsince the s ring a is not tensione by ro--.

tation of t e member 1' and has, as a consequence, no tendenc to turn the shaft 0 or the member 1* bac into its previous position. The loop holder is then withdrawn from the fabric and as a result the shear-limb Fig.

pressed back into t e open position h 5). As a conse uence, t e shaft 0 an member 1' are a so returnedjnto their previous positions. Next the loop holder is thrust into the following hole contiguous to the needle. If, then, the needle is withdrawn while the loop is held fast b loop holder, the lug u striking from low against the member 1- causes the latter to berotated back, this return movement having drawing, it will be understood that the drive can be effected also by the application of motor ower.

It wil thus be seen'that the device combines into one process the previously distinct operations of forming and cutting the loop. This means a considerable saving of time since a special shearing or smoothing treatment may be dispensed with, the loops being cut open in a perfec'tlyuniform manner immediately after being formed. This does away with all waste, and allows of a considerable saving of thread material.

Having thus described my invention What I claim as new and desire to secure by Letters Patent is 1 -1. A thread loop stitching device including, in combination, guide rods, a needle carried b one rod, a loop holder carried by the ot er rod, cooperating cutting members one of which forms a part of said 100.

holder and "the other of which is pivote theretofa rod connected to the last nam d cutting'member, and *means'on one of t a guide rods and connected to the last-named the rod for actuating said last named cutting member to out a loop.

2. A thread loop stitching device including, in combination, guide rods, a needle carried by one rod, a loop holder carried by the other rod, cooperating cutting members one'of which forms a part of said loop holder and the other of which is pivoted ing, in combination, guide rode, a needle carried by one rod, a loop holder carried by the other rod, coo erating cutting members one of which ibrms a part of said loop holder and the other of which is pivoted thereto,- a rod connected to the last named cutting member, means on one of the guide rods and connected to the last named rod for actuating said last named cutting member to out a loo and a stop on said first named guide rod engageable with said pivoted cutting member to restore it to open position.

In testimony whereof I have signed my name to this specification.

ADOLF DIETZ. 

